mild itching, burning, redness, or other skin irritation where the patch was worn.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is the most important information I should know about diclofenac transdermal (Flector Patch)?

Do not use this medication if you have ever had asthma or a severe allergic reaction caused by aspirin, diclofenac (Cataflam, Voltaren), or another non-steroidal anti-inflammatory drug (NSAID). Do not use diclofenac just before or after having heart bypass surgery (also called coronary artery bypass graft, or CABG).

While the risk of absorbing diclofenac transdermal into your bloodstream is low, an NSAID may cause life-threatening heart or circulation problems such as heart attack or stroke, especially if you use it long term.

Get emergency medical help if you have chest pain, weakness, shortness of breath, slurred speech, or problems with vision or balance.

This medicine may also cause serious effects on the stomach or intestines, including bleeding or perforation (forming of a hole). These conditions can be fatal and can occur without warning while you are using diclofenac transdermal, especially in older adults.

Call your doctor at once if you have symptoms of stomach bleeding such as black, bloody, or tarry stools, or coughing up blood or vomit that looks like coffee grounds.